Brazilian aeolian sediments dating using tl, osl and esr
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2023
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INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th
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In this work, a dunefield known as Dama Branca (Brazil) has been dated using the following
techniques: Optically Stimulated Luminescence (OSL), Thermoluminescence (TL) and Electronic Spin
Resonance (ESR). They are part of what is called “trapped charge dating technique”. Sediments have been
collected from several points to study age distribution throughout Dama Branca. These ages are related to
events of sediment transportation and stabilization. For Dama Branca specifically, variables related to
weather such as rainfall and wind power are suspected to be responsible for its formation. OSL results
were obtained applying the SAR protocol. TL and ESR results were obtained using the Multiple Aliquot
Additive Dose protocol (MAAD). With respect to ESR measurements, the Ti-Li center was chosen for
dating since it can be completely bleached by sun light exposure , which makes it suitable for aeolian
sediment dating. The Ti-Li center is strongly dependent upon preheat, its stability has been assessed and a
preheat temperature of 180 °C was selected. OSL ages are within 0.05 kyears and 2.05 x kyears. TL ages
agree with OSL ages for samples collected from the dune base, however there are discrepancies between
OSL and TL ages for the DBM2BASE sample, suggesting that it underwent a quicker burial process. ESR
results are satisfactory for two samples, 2DB10 and 2DB11 (they follow OSL and TL results). The ages
were compared to a simplified morphological study. In recent works about the weather in the Cabo Frio
region it has been seen that the studied areas were formed under influence of arid conditions and cold
water, variables that control sediment transportation in the region. Keywords (max. 5): TL, ESR, OSL,
quartz, sediments dating.
Como referenciar
CARMO, LUCAS S. do; WATANABE, SHIGUEO; DEWITT, REGINA. Brazilian aeolian sediments dating using tl, osl and esr. In: INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th, September 17-22, 2023, Viareggio, Italy. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/47971. Acesso em: 09 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.